Isotope effect on miscibility of acetonitrile and water |
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| Institution: | 1. Planetary Exploration Research Center (PERC), Chiba Institute of Technology, Tsudanuma 2-17-1, Narashino, Chiba, 275-0016, Japan;2. Division of Particle and Astrophysical Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan;3. Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan;4. Department of Earth and Planetary Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan;5. School of Arts & Sciences, The University of Tokyo, 3-8-1, Komaba, Meguro, Tokyo, 153-8902, Japan;6. Hamburger Sternwarte, Gojenbergsweg 112, 21029, Hamburg, Germany;7. Laboratoire d’Études Spatiales et d’Instrumentation en Astrophysique (LESIA), Observatoire de Paris, Section de Meudon, 92195, Meudon Principal Cedex, France;1. B. Verkin Institute for Low Temperature Physics & Engineering NASU, Kharkiv 61103, Ukraine;2. ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK |
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| Abstract: | The miscibility of four binary liquid mixtures containing acetonitrile (ACN, ACN-d3) and water (H2O, D2O) has been studied. All the measured systems present solubility curves characterized by slight asymmetry and the presence of an upper critical solution temperature (UCST). It is found that all systems have approximately the same critical composition and approximately the same shape of the phase diagrams. There is also no influence on the critical exponent. However, it has been found that isotope substitution diminishes solubility in each case independently of the site of deuterium substitution. This observation is accounted for in terms of the specific interactions of acetonitrile and water. |
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